Safety razor



l Sept l, 1931 w. H. PARRY 1,821,072

SAFETY RAZOR Filed May l5. 1929 /4 n /NVENTU/Q..

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Patented Sept. 1, 1931 i UNITED STATES PATENT OFFICE WILLIAM H. PARRY,OF MALDEN, MASSACHUSETTS, ASSGNOR T GILLETTE SAFETY RAZOR COMPANY, OFBOSTON, MASSACHUSETTS, A CORPORATION OF DELAWARE SAFETY RAZOR eApplication filed May 15,

rI`his invention rrelates to safety razors of the type in which a capand a guard member are adapted to be clamped together upon a thinflexible blade to hold it in position for sharing. or to be separated torelease the blade for itunoval-and replacement.

lt is desirable in a razor of this type that the clamping engagement ofthe cap and guard should he ellected quickly in preparlng the razor forluse and that theyshould be disengaged with equal facility after use whenit is desired to remove the blade and clean the razor. It is alsoimportant that the engagement of the cap and guard should 'ie madefirmly under adequate.- pressure and f reliably maintained while therazor is being used. The latter condition is essential because anyloosening of the razor parts perniittiug an increase of the edgeexposure of the blade while the razor is being used renders it extremelydangerous to the user.

I hare discovered a construction which successfully meets therequirements above outlined and possesses also the mechanical advantagesof compactness in design and convenience of manufacture.

In one aspect accordingly my invention consists in a safety razorcomprising a cap having a stud With an enlarged head provided with alongitudinal passage in one side thereof, a guard and a handle adaptedto clamp the two together by interlocking with the stud of the cap andfor this purpose having a bore of sullicient diameter to receive thehead of the stud and an internal projection adapted to pass through thepassage therein and interlocking with it.. By providing an inclinedContact face' between the internal projection of the handle and the capstud. the cap and guard may be drawn together under powerful pressure bya slight rotation of the handle, and when the desired "clampingengagement has4 been once effected there is no tendency, while the razoris being used, to disturb this relation.

These and other features of the invention will be best understood andappreciated from the following description of a preferred embodimentthereof, selected for purposes of 1929. Serial No. 363,247.

illustration and shown in the accompanying drawings in which:

Fig. 1 is a view in perspectiveol the cap memlzer of the razor.

Fig. 2 is a view in perspective of the handle with portions broken away.

Fig. l is a sectional view ofthe cap member.

Fig. 4 is a view of the razor partly in elevation -and partly insection, showing the parts thereof assembled but not clamped.

Fig. 5 is a sectional view of the line 5 5 of Fig. 4.

Fig. (i is a view similar to Fig/1 but showing parts of the razor inclamped condition, and

Fig. 7 is a sectional View on the line 7-7 of Fig. 6.

In the preferred embodiment of the razor, the cap 10 comprises atransversely curved bar having an inner concave blade-shaping surfaceandan exterior convex face. From the concave face of the cap extends apair of cylindrical locating studs 12 spaced equally from the ends ofthe cap. A center stud 14 also projects from this surface, beingprovided with a collar 15 adjacent tothe face of the cap and with anenlarged cylindrical head 16 at its outer end. The inner or overhangingface ofthe head 16 is inclined or spiral in shape, for a purpose whichwill presently appear, and one. side of the head 16 is provided with alongitudinally extending groove or channel 17.

The guard member 22 of the razor is perforated to receive the locatingstuds 12 and the center stud 14. It is provided at either edge with aseries of guard teeth and with a lblade-engaging face having a pair ofparallel fulcrum shoulders 23 similar to those of the guard memberdisclosed in U. S. Patent No. 1328.024 granted January 13, 1920. In theassembled razor the flexible blade is bent over the shoulders 23 by theconcave bladeshaping face of the cap.

The handle of the razor may be of any desired shape so long as itcooperates with the center stud 1l of the cap member. As herc- 4in shownthe handle 2l is tubular in forni and somewhat concave at its inner endso as to present a fair bearing against the outer face of the guard 22.In its diameter the .bore of the handle is substantially equal to thediameter of the cylindrical head 16 of the cap stud. Adjacent' to itsend the bore is provided `With an internal rib 26 corresponding' incross section substantially to the cross sectional area of the channel17in the head 16 of the cap stud and of such length as to it With aslight clearance beneath the overhanging surface ofthe 'head 16 when theparts of the razor are assembled in their respective initial positionsas shown in Fig. 4. The rib 28 at its outer end extends substantiallyflush with, the end or giard engaging face of the handle.

Y The blade 2() comprises a thin flexible douj ble-edged bladeperforatedto receive the locating studs 12 and the collar 15 of thecenter cap stud 14. The blade is accurately positioned transverselybetween the cap and` guard by these studs andV is curved intosubstantial vconformity to the concavev face of the cap 10 Awhen theparts are drawn into clamping relation.

l'ln assembling the illustrated razor for use, the parts are broughttogether in the condition shown in Fig. 4, thatfis to say, the blade 20and the guard 22 are threaded upon the studs of the cap 10 andthe centerstud.

14 is inserted in the bore of the handle, the rib 26 passing through thechannel 1 7 .oithe head 16. The shape and slope .of the overhanging orundercut surface of the head 16 is such that when the handle 24is turnedin a clockwise direction as seen in Figs. 5 and 7 the inner end of therib 26 will coact with the overhanging surface. of the stud tov draw thestud inwardly and'move it into clamping relation with the guard 22, asshown in Fig. j

6. In eiecting this motion the rib 26 which originally coincides inangular position with the channel or groove 17 is moved angularlythrough substantially 12() degrees to the dotted line position indicatedinFig. 7. It may be noted that the collar 15. adjacent to the cap 10extends beyond a line joining the effective edges of the cap, thusensuring registration ofthe collar with the holey in the vthe 'ixedend'of said stud ttingwithin the hole' said guard plate, said collarextending beyond a line joining the longitudinal edges of said cap, andsaid stud having a vneck'of reduced diameter connecting said collars. jM

2. A safety razorcomprising aoap and a cooperating guard adapted to holda blade between them, ashort stud projecting loutwardly from the bladeengagin yface of the cap and having a cylindrical en argementat its freeend7 a handle having an end face for engaging the guard and acylindrical bore in one end for receiving and fitting said enlargement,the inner .en'dwall of the enlargement being inclined tol provide avc'am like shoulder, and one side portion of tlie enlargement beingslotted from its outer .end through the said inclined Walhand laninwardly projecting lug of substantial length,l located Within the boreofthe handle and ex-` tending to the guard engaging face thereof forpassing through the slot and engaging against the 'said end wall, avportion of the stud inwardly from said end vvv'all being of reduceddiameter.

Signed at Boston, Massachusetts, thisl4th day of May, 1929.

guard plate before the application of tension to the blade 20 byrotation of handle 24. In order to release the cap and guard from`clamping position it is necessary onlyfto turn the handle back to itsinitial position bringing the rib 26 again into registration with thegroove 17, vvhereupon the cap is ree to be separated from the guard, thehead 16 being free to be longitudinally removed out of the bore of thehandle.

Having thus disclosed my invention and described' a preferred embodimentthereof,

`what I claim as new and desire to secure by Letters Patent is f 1. Asafety razor comprising a guard plate having a blade shaping surface anda WILLIAM PARRY,

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